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Section 816.116 (b ). <br />i (b)(1) Ground cover and productivity of living plants on the revege- <br />tated area within the permit area shall be equal to the ground cover and <br />productivity of living plants cn the applied reference area or to the <br />standards in other technical guides approved by the Director for use in <br />the regulatory program. The period of extended responsibility under the <br />performance bond requirements of Subchapter J initiates when ground <br />cover equals the approved standard after the last year of augmented <br />seeding, fertilizing, irrigation or other work which ensures success <br />in-- <br />(i) Areas of more than 26.0 inches average annual precipitation; and <br />continues for not less than five years. Ground cover and productivity <br />shall equal the approved standard for the last two consecutive years of <br />the responsibility period; or in <br />(ii) Areas of less than or equal to 26.0 inches average annual precipi- <br />tation; and continues for not less than 10 years. Ground cover and pro- <br />. ductivity shall, the approved standard far the last two consecutive <br />years of the resposnsibility period. <br />(2) For purposes of paragraph (b)(1) of this Section, the average <br />annual preciptation can be determined either-- <br />(i) By interpolation, using standard techniques, from 'Mean Annual <br />Precipitations', Map, p.97, The National Atlas of the United States, <br />U.S. Department of the Interior, Geological Survey, 1970; or from 'Climatic <br />Atlas of the United States', U.S. Dept. of Commerce, National Oceanic <br />and Atmospheric Administration, 1974; or from long-term precipitation <br />averages from 'Climatological Data', U. S. Dept. of Commerce, National <br />Oceanic and Atmospheric Administration; or from other official records; <br />or <br />(ii) Based on 10 years of continuous and reliable precipitation records <br />from stations located in or adjacent to the mine plan area. <br />816-158 <br />